On Nov 26, 9:30 pm, jack wrote: > I found the following entry in the log file: > Using user-mode PPS timestamp > Does it mean NTP reads the GPS strings and sees the 1PPS signal?
Pretty much, yes. That message occurs only upon reading a CR when a DCD transition has been observed and its timestamp is used instead of the end-of-line CR/LF timestamp. That "user-mode" PPS hack only works if the GPS is configured to emit only one sentence per second, and it allow you to get most of the benefit of PPS without requiring serialpps.sys. Since the topic mentions a USB GPS, unless the GPS is documented to deliver PPS via its emulated serial's DCD, you may be seeing meaningless DCD transitions rather than PPS. You have serialpps.sys, so you might consider enabling PPSAPI use by the NMEA refclock driver using fudge 127.127.20.1 flag1 1 Good luck figuring out the problem that's keeping it unreachable. Cheers, Dave Hart _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
